switching to C++ compiling by -xc++ (was: gnucash master: Multiple changes pushed)

[Mike Alexander]

--On April 28, 2014 7:47:07 AM -0700 John Ralls <jralls at ceridwen.us> 
wrote:

> I'll make gnucash-bin.cpp after that.

Why not do it first?  It needs to be done sooner or later and that 
might avoid some of the explosions.

              Mike